Raman study of magnetic excitations and magnetoelastic coupling in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:msub><mml:mtext>-SrCr</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Valentine, Michael E.; Koohpayeh, S. M.; Mourigal, Martin; McQueen, Tyrel M.; Broholm, C.; Drichko, Natalia; Cava, R. J.; Birol, Turan; Das, Hena; Fennie, Craig J.

doi:10.1103/physrevb.91.144411

Cited by 12 publications

(14 citation statements)

References 45 publications

(62 reference statements)

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“…We note that though the magnetic Raman response of Cd2Os2O7 shows a good agreement with its M-DOS [56], difficulties have been encountered in interpreting the twomagnon Raman data of other non-collinear magnets such as α-SrCr2O4 [57] or Bi2Fe4O9 [58]. To the best of our knowledge, the impact of these effects on the magnetic Raman response have only been evaluated for the case of a triangular lattice [59,60].…”

Section: Magnetic Raman Scatteringmentioning

confidence: 99%

Raman scattering study of lattice and magnetic excitations in CrAs

et al. 2019

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We report on the lattice and spin dynamics in the monopnictide CrAs using polarized Raman scattering. This system exhibits a first-order magneto-structural phase transition at ~ 265 K, below which the magnetic moments of Cr form an incommensurate double helical magnetic structure while the unit cell volume abruptly expands. Across the transition, the frequencies of the fully symmetric Ag phonons strongly renormalize, which along with the results of first-principle calculations suggest the presence of a sizeable coupling of the phonons to the magnetic degrees of freedom in this compound. In addition, we observe two broad modes around 350 and 1700 cm -1 in the magnetic phase, which we associate with two-magnon Raman scattering. This work provides one of the few examples of magnetic Raman scattering from a non-collinear magnet.

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Section: Magnetic Raman Scatteringmentioning

confidence: 99%

Raman scattering study of lattice and magnetic excitations in CrAs

et al. 2019

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“…A previous RIXS calculation [47] on TLAF has investigated the polarization-independent bi-and trimagnon spectrum. An unpolarized Raman scattering has been reported in α-SrCr 2 O 4 [41], which is a distorted TLAF. As the highest energy of one magnon is about 20 meV [17], the high-energy peak above 40 meV in Raman experiment [41] of α-SrCr 2 O 4 may be a trimagnon excitation.…”

Section: Torque Equilibrium Spin Wave Theory Raman Spectrummentioning

confidence: 92%

“…An unpolarized Raman scattering has been reported in α-SrCr 2 O 4 [41], which is a distorted TLAF. As the highest energy of one magnon is about 20 meV [17], the high-energy peak above 40 meV in Raman experiment [41] of α-SrCr 2 O 4 may be a trimagnon excitation. In addition to the unpolarized Raman detection, the polarization-dependent Raman spectrum may provide another view to study the features of bi-and trimagnon excitation.…”

Section: Torque Equilibrium Spin Wave Theory Raman Spectrummentioning

confidence: 92%

“…3. Raman scattering is a valid tool to detect magnon excitations due to its sensitivity to magnonmagnon interactions and polarization [37][38][39][40][41][44][45][46]. A previous RIXS calculation [47] on TLAF has investigated the polarization-independent bi-and trimagnon spectrum.…”

Section: Torque Equilibrium Spin Wave Theory Raman Spectrummentioning

confidence: 99%

“…In this context, Raman spectroscopy serves as a powerful tool to probe lattice distortions and the effect of ground state quantum fluctuations. It has already been used to detect magnon excitations in TLAF [37][38][39][40][41][42][43]. Raman's advantage is the sensitivity to polarization geometry [44] and magnon-magnon interactions [45,46], which is helpful for studying the high energy continuum.…”

Section: Introductionmentioning

confidence: 99%

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Torque equilibrium spin wave theory of Raman scattering in an anisotropic triangular lattice antiferromagnet with Dzyaloshinskii-Moriya interaction

Shan,

Jin,

Datta

et al. 2020

Preprint

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We apply torque equilibrium spin wave theory (TESWT) to investigate an anisotropic XXZ antiferromagnetic model with Dzyaloshinskii-Moriya (DM) interaction in a triangular lattice. Considering the quasiparticle vacuum as our reference, we provide an accurate analysis of the non-collinear ground state of a frustrated triangular lattice magnet using the TESWT formalism. We elucidate the effects of quantum fluctuations on the ordering wave vector based on model system parameters. We study the single magnon dispersion, the two-magnon continuum using the spectral function, the Raman spectrum of bimagnon and trimagnon excitations. We present our results for the HH, VV and the HV polarization Raman geometry dependence of the bimagnon and trimagnon excitation spectrum where H(V) represents horizontal (vertical) polarization. Our calculations show that both the HH and the HV polarization spectrum can be used to determine the degree of anisotropy of our system. We calculate the Raman spectra of Ba 3 CoSb 2 O 9 and Cs 2 CuCl 4 .

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Room Temperature Spin‐Phonon Coupling in Cr₂O₃Nanocrystals

Testa‐Anta

Majcherkiewicz

et al. 2023

Adv Funct Materials

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In this study, nanocrystals of antiferromagnetic Cr2O3 are shown via Raman spectroscopy to display peculiar lattice dynamics in terms of phonon softening and the occurrence of an exceptionally strong spin‐phonon coupling. This effect, which is observed to persist well above the onset of the antiferromagnetic ordering temperature, is ascribed to locally correlated spin fluctuations due to the modulation of the magnetic exchange interactions as the chromium atoms oscillate about their equilibrium position. It is found that the spin‐phonon coupling strength is governed by the competing antiferromagnetic and ferromagnetic interactions, where changes in the surface spin configuration can also play a crucial role. Overall, this work proves the size dependence of the interplay between the crystalline and magnetic structures in 3D antiferromagnets varying the surface‐to‐volume ratio and helps establish the fundamentals for a spin‐phonon coupling engineering at the nanoscale via a simple route in a very stable and easy to synthesize material. More importantly, it demonstrates the possibility of coupling phononic excitations with the magnetization dynamics at room temperature, offering a highly prospective nanomaterial for the design of novel magnonic devices.

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Raman study of magnetic excitations and magnetoelastic coupling inα-SrCr2O4

Cited by 12 publications

References 45 publications

Raman scattering study of lattice and magnetic excitations in CrAs

Raman scattering study of lattice and magnetic excitations in CrAs

Torque equilibrium spin wave theory of Raman scattering in an anisotropic triangular lattice antiferromagnet with Dzyaloshinskii-Moriya interaction

Room Temperature Spin‐Phonon Coupling in Cr₂O₃Nanocrystals

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Raman study of magnetic excitations and magnetoelastic coupling inα-SrCr2O4

Cited by 12 publications

References 45 publications

Raman scattering study of lattice and magnetic excitations in CrAs

Raman scattering study of lattice and magnetic excitations in CrAs

Torque equilibrium spin wave theory of Raman scattering in an anisotropic triangular lattice antiferromagnet with Dzyaloshinskii-Moriya interaction

Room Temperature Spin‐Phonon Coupling in Cr2O3Nanocrystals

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Room Temperature Spin‐Phonon Coupling in Cr₂O₃Nanocrystals